Category

Published on

29 Jul 2013

Abstract

Paper regarding experiments submitted and presented at the 30th International Conference on Offshore, Ocean and Arctic Engineering, held in Rotterdam, the Netherlands. The objective is to investigate the effect of combined swell-tsunami interaction on the nature of the tsunami Ã¢Â€Â“ in particular the surface elevation, the runup speed and the near-bottom velocities. Laboratory testing in the Tsunami Wave Basin at
Oregon State University has been performed to simulate this interaction, with free surface elevations and near-bottom
velocities measured at various locations over a plane sloping
beach. Random wavetrains with varying initial mean steepness
were generated in concert with the tsunami. Preliminary
analysis of the data reveals that high steepness ocean swell
changes the spectral signature of the tsunami, particularly at
high frequencies. There is also a significant difference in
location of the breakpoint of the tsunami with overriding swell.